Establishing a Mathematical Model to Predict the Tensile Strength of Friction Stir Welded Pure Copper Joints

A 1D electrochemical-thermal model of an electrode pair of a lithium ion battery is developed in Comsol Multiphysics. The mathematical model is validated against the literature data for a 10 Ah lithium phosphate (LFP) pouch cell operating under 1 C to 5 C electrical load at 25 • C ambient temperature. The validated model is used to conduct statistical analysis of the most influential parameters that dictate cell performance; i.e., particle radius (r p ); electrode thickness (L pos ); volume fraction of the active material (ε s,pos ) and C-rate; and their interaction on the two main responses; namely; specific energy and specific power. To achieve an optimised window for energy and power within the defined range of design variables; the range of variation of the variables is determined based on literature data and includes: r p : 30-100 nm; L pos : 20-100 µm; ε s,pos : 0.3-0.7; C-rate: 1-5. By investigating the main effect and the interaction effect of the design variables on energy and power; it is observed that the optimum energy can be achieved when (r p < 40 nm); (75 µm < L pos < 100 µm); (0.4 < ε s,pos < 0.6) and while the C-rate is below 4C. Conversely; the optimum power is achieved for a thin electrode (L pos < 30 µm); with high porosity and high C-rate (5 C).

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“…The residuals follow a straight line, revealing that the fitted regression models are valid [50,52].…”

Section: Results Of Anovamentioning

confidence: 75%

Electrochemical-Thermal Modelling and Optimisation of Lithium-Ion Battery Design Parameters Using Analysis of Variance

2017

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“…The effect of square pin tool and cylindrical pin with threads tool pin geometries were considered in terms of the microstructure and mechanical strength of FSW joints of copper alloy and the test results revealed the presence on a finer recrystallized grain structure in the square pin tool and better mechanical properties compared to threaded cylindrical pin 19 . Other studies have also confirmed the achievement of higher tensile strength by square pin and triangular pin compared to the welded sample using the cylindrical, taper and threaded tool pin profiles 20 . On the other hand, the scrolled shoulder tool has been found to be more effective than the conical pin for improving welding strength.…”

Section: Introductionmentioning

confidence: 67%

Effect of Scroll Pin Profile and Tool Rotational Speed on Mechanical Properties of Submerged Friction Stir Processed AZ31B Magnesium Alloy

Ramaiyan

Santhanam

Muthuguru³

2018

Mat. Res.

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In this study, an effort has been made to choose an appropriate tool pin profile and rotational speed for a tool using a submerged friction stir processed hot rolled AZ31B magnesium alloy. A defect free process region was obtained using a novel tool shoulder, which consisted of a scroll. Three tool pin profiles, namely, simple cylindrical, stepped cylindrical and stepped square pin have been used. Tensile properties and fracture behavior revealed defect free friction stir processed specimens. The microstructural studies reveal the possibility of producing a defect free processed region using the stepped square pin tool geometry. The presence of fine recrystallized grains (1.99 µm) and the absence of defects in the processed region lead to higher hardness and superior tensile properties.

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“…Response Surface Methodology (RSM) developed by Box and Wilson [4] in 1951 has been proven to be an accurate method to model and optimize the FSW process. [5][6][7][8][9][10] In RSM, the most important purpose is optimizing the response surface that is a function of different process parameters. This method also predicts the relationship between the input parameters and the achieved response surfaces.…”

Section: Friction Stir Welding (Fsw) Was Invented At Thementioning

confidence: 99%

Establishing Mathematical Models to Predict Grain Size and Hardness of the Friction Stir-Welded AA 7020 Aluminum Alloy Joints

Ilkhichi

Soufi

Hussain

et al. 2014

Metall Mater Trans B

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In this study, response surface methodology in conjunction with a central composite design was applied to predict the grain size and hardness of friction stir-welded AA 7020 aluminum alloy joints. For this purpose, three welding parameters, including tool rotational speed, traverse speed, and tool axial force, at five levels and 20 runs were considered. In order to validate the predicted models, the analysis of variance was performed. Hardness and microstructural features of the joints were investigated using microhardness test and optical microscopy, respectively. In addition, the influences of friction stir welding parameters on grain size and hardness of the joints were examined thoroughly. The analysis of variance results revealed that the developed models were significant and accurate to predict the responses. Furthermore, with increasing the heat input, the hardness of the joints decreased, where the grain size increased continuously. In addition, the optimized condition for achieving the lowest grain size and highest hardness of the joints was reached as 800 rpm, 125 mm/min and 8 kN.

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Establishing a Mathematical Model to Predict the Tensile Strength of Friction Stir Welded Pure Copper Joints

Cited by 48 publications

References 22 publications

Electrochemical-Thermal Modelling and Optimisation of Lithium-Ion Battery Design Parameters Using Analysis of Variance

Electrochemical-Thermal Modelling and Optimisation of Lithium-Ion Battery Design Parameters Using Analysis of Variance

Effect of Scroll Pin Profile and Tool Rotational Speed on Mechanical Properties of Submerged Friction Stir Processed AZ31B Magnesium Alloy

Establishing Mathematical Models to Predict Grain Size and Hardness of the Friction Stir-Welded AA 7020 Aluminum Alloy Joints

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